hilpin



. N I P L A H D OUT-OPP VALVE GEAR.

Patented Jan.23, 1883.

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lUNITED STATES PATENT -rricn.

DRUITT HALPIN, OF WESTMINSTER, ENGLAND.

CUT-OFF-YALVE GEAR.

SPECIFICATION forming part of Letters Patent No. 271,063, dated January 23, 1863. Application filed July 18,1882. (No model.) Patented in England April 6, 1882, No. 1,675, and in France April 14, 1882, No. 148,415.

To all whom it may concern:

Be it known that I, DRUITT HALPIN, a subject of the Queen of Great Britain aud Ireland, residing at Victoria Chambers, in the city of WVestminster, Kingdom of Great Britain and Ireland, have invented new and Ira proved (Jut- Off-Valve Gear for Steam Engines, (for which I have obtained a patent in Great Britain, No. 1,675, hearing date April 6, 1882,) of which the following is a Specification.

My invention relates to a construction and arrangement of slide-valve and gear for working-it, in which the valve is caused to move in a path that will be hereinafter referred to as the resultant of two motions at right angles to each other, by which I mean that the valve is moved longitudinally to and fro bya rod worked from an eccentric in the usual way, and is also caused to rock in a plane parallel to the slide-face, the edge of the slide and the cylinder-ports being so shaped that by the rocking movement of the slide, combined with its longitudinal reciprocation, the cut-off can be varied, while the exhaust remains constant. For this purpose I give the slide-rod, besides its to-a-nd-fro reciprocation, a partial revolution to and fro round its axis, so that the slide worked by it is caused to move both longitudinally and transverselythat is, in a path the resultant of a longitudinal and a transverse movement--and some of the edgesot' its face,

as well as some of the edges of the steam-ports,

being made oblique, the cut-off can be varied according to the greater or less extent of the transverse movement, while the exhaust, depending, as it does, only on the longitudinal movement, remains constant. The rod works in a swivel in the head by which it is linked to the eccentric, and it has projecting from it an arm, which is linked toa reciprocating lever worked by another eccentric, or by a suitable system of levers and rods from the main eccentric,thus giving the rod its rotary reciprocation. The extent of this reciprocation may be determined by a link motion that can be adjusted by hand, or varied by a governor, or in other known ways adopted for varying cut-oft and expansion. The slide may have a cylindrical face workingin a cylindrical hollow on the side of the main cylinder, this face andi-hollow being struck frpm the axis of the slide-rod as a center; or, as an equivalent, the slide and the facing on which it works may be fiat, the slide-rod being coupled to the valve by connections admitting of the rectilinear move ment of the slide, while these arms move in a circular path. Instead of a single slide governing ports near the middle of the cylinder, two short slides governing ports near the ends of the cylinder may be worked in the same manner.

Referring to the accompanying two sheets of drawings, which form part of this specification, Figure l is a side elevation of an engine with slide-valve-operatiug gear according to my invention. Fig. 2 is a plan of the same. Fig.3 isalongitudinal section through the valve-chest, valve, and ports. Fig. 4 is a vertical transverse section of the same. Fig. 5 is a vertical cross-section. Fig. 6 is an elevation ot'the cylinder-face, showing the ports. Fig. 7 is an elevation of the valve-face. Figs. 8 and 9 are two views of thelink j. Fig. 10 is an elevation of the cylinder-faceto work with the flat valve shown in Figs. 11 and 12. Fig. 11 is a back elevation, partly in section, showinga flat slide-valve and its'bridle. Fig. 12 is an edge view of the same, also partly in section. Fig. 13 shows the bracket or carrier that is fixed to the valve-rod and transmits its motions to the valve. Fig. 14 shows the valve-rod and the manner of connecting it to the eccentric-rod.

The slide-rod (0 receives a toand-fro reciprocation from an eccentric not shown in the drawings, but having a rod, b, of which the end can be seen in Fig. 14 Besides its endwise reciprocation, the slide-rod has a reciprocatory motion in a rotary sense around'its axis, and to permit of this it is coupled to thee:- centric-rod by a swivel-connection formed of two pieces, (I d, which embrace the grooved end of the rod (1. The two pieces are bolted to a distance-piece, d, which acts as a gudgeon for the eye of the rod 1) to oscillate on, and are further held together by being situated within the guide 0. The rotary reciprocating motion of the slide-rod is derived from an eccentric not shown in the drawings, but which is connected by a rod to the pin fon the lever g. This lever is mounted on a short shaft, h, carrying at the other end a curved arm, 3, which -2. evinoce is coupled by a link, j, Figs. 1, 8, and 9, to the spherical end of the arm or stud k, projecting from the slide-rod a, Figs. 2, 5, and 14. This link has a spherical bearing at its upper end, and at its lower end carries aspherical pin, Z, working in a corresponding bearing in a block, m, which can slide on the curved arm 6. The position of the block on the curved arm determines the amountof rotary motion of the sliderod, and is regulated by a rod or link, a, which is connected to the governor 0. Within the valve-chest there is keyed on the slide-rod a a bracket or carrier, p, Figs. 3 and 4, with two arms ending in forks, which serve to impart endwise motion to the valve, and at the same time embrace the ends of a pin, q, fixed in the valve a. The pin g has two surfaces at each end, so that it cannot rotate in the forks, al-

. though it is free toinove outward, so that the valve may always keep up to the face a on the cylinder, and so that no harm may result it the center of the curved valve-face and that oftherod donot exactly coincide. Each steampassage of the cylinder may have one or more ports or outlets (two being shown, 0 r or r" r) in the valve-face, and those of the cylinder may be similarly constructed and arranged. The contour of the valve a, as is shown in Fig. 7, is appropriately formed to work in accordance with the ports, and has each edge provided with as many inclines as there are ports to each passage. The exhaust-passageshas only one outlet in the cylinder-face. The acting or opening and closing edges of both the valves and steam-ports are inclined to the axis of the cylinder, in order that the point of cut-offmay be varied by the peculiar motion of the valve. The endwise reciprocation of the valverod opens and closes the ports in the usual way, and its reciprocation in arotary sense also opens and closes them. Thesetwo motions take place in opposing phases. If the acting edges of the ports were vertical, the rotary motion of the valves would be useless, while on thcotherhand,iftheywerehorizontal,theopening and closing would be due to the rotary motion of the valve only. When the rotary motion of the slide-rod is a minimum the maximum area of the ports? 1* is uncovered and the steam admitted until the latest point of cut-ofi" for which the valve is designed. When the governor moves the block at toward the free end of the curved arm i the rotary motion of the slide is increased until in the extreme position the resultant of rotary and rect-,

ilinear motions is during a part of the stroke approximately parallel to the inclined edges of the ports. When the valve-face is flat, as in Figs. 11 and 12, the valve is encircled by a bridle, t, in which is fixed a pin, q, Figs. 11 and 12, held in the arms of the carrier 1). The pin (1 passes through a deep slot cut in the back of the valve, which is thus perfectly free to adjust itself to the cylinder-face.

What I claim is- 1. In a fluid-pressure engine, the combination of a slide-valve having inclined actingedges, a valve-face having ports withinclined acting-edges, a single valve-rod, and means for imparting a longitudinal reciprocation to the same, with a curved arm, 1?, link 9', stud k, lever n, and governor 0, substantially as described.

2. In a fluid-pressure engine, the combination of a slide-valve, a, a slide-rod, a, a swivel- .connection, d, an eccentric-rod, b, an arm or lever, g, a link,j, a curved arm, 71, and means for effecting its reciprocation, substantially as described.

3. In a fluid-pressure engine, the combination of a slide-valve, a, a valve-face, a a sliderod, a a swivel-connection, d, an eccentric-rod, b, an arm or lever, g, a link,j, a curved arm, i, and means for effecting its reciprocation, substantially as described.

DRUlTT HALPIN.

W'itnesses:

RUDOLPH OI-IAs. NIcKoL, HENRY J AS. FULLER,

Both of 31 Lombard Street, London. 

